typedef void (GLUTCALLBACK *GLUTidleFCB) (void);
/* Functions that set and return Fortran callback functions. */
-GLUTAPI void* APIENTRY __glutGetFCB(int which);
-GLUTAPI void APIENTRY __glutSetFCB(int which, void *func);
+GLUTAPI GLUTproc APIENTRY __glutGetFCB(int which);
+GLUTAPI void APIENTRY __glutSetFCB(int which, GLUTproc func);
#endif /* __glutf90_h__ */